ZenovayTools

IPv6 Readiness Checker

Check if your domain is IPv6-ready. Tests AAAA records for www, root domain, mail server, and nameservers. Detects IPv6 PTR records, Teredo/6to4 tunnels, and dual-stack configuration. Get an IPv6 adoption score.

How to Use IPv6 Readiness Checker

  1. 1Enter a domain name to check IPv6 readiness.
  2. 2AAAA records are resolved for your root domain, www, mail servers, and nameservers.
  3. 3PTR records are checked for reverse DNS of IPv6 addresses.
  4. 4An IPv6 adoption score and recommendations are shown.
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Frequently Asked Questions

Why does IPv6 readiness matter?▾
IPv6 is the successor to IPv4, which has exhausted its address space. ISPs and mobile networks increasingly use IPv6-only or IPv6-preferred routing. Without IPv6 support, your site may be slower for IPv6 users (who must use transition mechanisms), and you may be unreachable if their ISP has poor IPv4 connectivity. Major platforms like Google, Facebook, and Netflix serve over 40% of traffic over IPv6.
What is a dual-stack configuration?▾
Dual-stack means your server has both an IPv4 address (A record) and an IPv6 address (AAAA record). This is the recommended approach during the IPv4 → IPv6 transition. Browsers prefer IPv6 over IPv4 (Happy Eyeballs algorithm, RFC 8305) when both are available, so dual-stack gives you the best of both. Pure IPv6-only is possible but may cause connectivity issues for legacy clients.
What are Teredo and 6to4 addresses?▾
Teredo (2001:0::/32) and 6to4 (2002::/16) are transitional mechanisms that tunnel IPv6 over IPv4 networks. They were designed as temporary solutions during IPv6 adoption and are now considered deprecated. Modern networks should use native IPv6 (global unicast addresses starting with 2 or 3, excluding the ranges above). Teredo and 6to4 are slower, less reliable, and may be blocked by firewalls.
How do I add IPv6 to my domain?▾
First, ensure your hosting provider or server has a native IPv6 address assigned. Then add an AAAA record in your DNS zone pointing your domain to that IPv6 address. For cloud providers like AWS, GCP, or Azure, enable IPv6 on your load balancer or instance. Your nameservers and mail servers should also get AAAA records for full IPv6 adoption. Contact your ISP or hosting provider if they do not offer IPv6.
Why do PTR records matter for IPv6?▾
PTR (reverse DNS) records for IPv6 addresses are important for email delivery — mail servers check that your sending IP's PTR record matches the hostname used in SMTP. Without PTR records for IPv6, your outgoing email may be rejected or marked as spam. IPv6 PTR records are set in the ip6.arpa zone and must be configured with your ISP or hosting provider who owns the IPv6 block.